Special Containment Procedures: SCP-000 is to be kept in containment chamber 29 with basic amenities such as a bed and running water. Due to the non-hostile nature of this SCP, level three personnel are permitted to keep guard within the containment chamber given that a secondary guard is then placed outside the door. Security cameras are to remain on at all times from five strategically placed positions within the chamber and all personnel must be given a full body search before proceeding to prevent SCP-000 from acquiring any forms of contraband.

Description: SCP-000 is four foot high sentient equine with the ability to communicate verbally in clear English. The anatomy of the SCP however bares very few similarities to a typical equine given the rounded shape of the cranium and flexibility of the joints and spine that allows the SCP to stretch in abnormal ways comfortably. While it is physically possible for the SCP to maneuver on its two back legs, it doesn't appear comfortable and typically walks on all four legs. SCP-000 coat and mane color are highly saturated shades of pink that don't appear to bend and absorb natural light like most objects do, giving SCP-000 a 'cartoonish' 2-D appearance. On both sides of it's flank appears to be the image of three brightly colored balloons. They appear to be natural to her appearance. SCP-000 claims that the mark is her 'Cutie Mark'.

It is unknown at this time how SCP-000 is able to pick up and use items meant for human hands with her hooves and use them with ease. SCP-000 was given access to a toy piano during testing, and the song 'Happy Birthday' was performed perfectly, despite SCP's hooves being too large for the keys for such a task. Upon closer examination it was discovered that it didn't matter what notes SCP did or did not strike, the intended song played out regardless. SCP appears to have no knowledge of how it is able to do this. Further testing will be required.

SCP-000 was discovered sleeping under Dr. ███████ desk. It is unknown how she arrived there as there is no caught security footage of her even entering the facility. Dr. ███████ was interrogated after the discover, however results conclude that he was obvious to the SCP's arrival as well. SCP-000 claimed that another force had purposely teleported it there from a alternate plane of existence.

Addendum:

I do plan on making more 'serious' SCP's in the future but I can help but give this one a shot. It's a lot of fun writing it at least. Thoughts?

Hey author, in the Guide for Newbies, we describe how to make a sandbox on the Sandbox Wiki and use it to hold a draft when looking for critique. Please do not post full drafts in the forums. I've collapsed this one for you. You can also update a post by clicking "options" and then "edit" to the lower right, rather than responding to yourself. -Light

Before I actually critique the article, I'd like to ask— what was the intention behind creating the article? Did you want it to be a joke article? Something for Project Crossover? Or did you just want to get the hang of writing in standard Foundation article tone and structure?

I think it might of been the last thing you said. Had some time to think and I realized that maybe I should post the mlp SCP's to a different site due to their later tone. Like I said, I do plan on making more 'serious' SCP's, I guess I just wanted to get my feet wet first.

For example

headphones that liquefy your brain

old porn magazine that causes intense feelings of paranoia and shame that escalate drastically

large sunglasses that darkens everyone else's vision in a certain radius

Due to the non-hostile nature of this SCP, level three personnel are permitted to keep guard within the containment chamber given that a secondary guard is then placed outside the door. Security cameras are to remain on at all times from five strategically placed positions within the chamber and all personnel must be given a full body search before proceeding to prevent SCP-000 from acquiring any forms of contraband.

Surveillance is also a standard for all containment chambers.
Special containment procedures typically focus around an anomalies' properties, though it seems that the only two anomalous properties mentioned in this article are that ponies don't normally exist and their hooves don't possess telekinetic properties.

SCP-000 is four foot high sentient equine with the ability to communicate verbally in clear English.

Scientists use the metric system, which means meters instead of feet.

If something is able to converse with humans and comprehend things like emotion and concepts, then they can be referred to as sapient.

Also, they would address that it resembles an equine, since you mention how it's missing a lot of normal parts of an actual animal.

The anatomy of the SCP however bares very few similarities to a typical equine given the rounded shape of the cranium and flexibility of the joints and spine that allows the SCP to stretch in abnormal ways comfortably.

Kind of a run-off sentence. Try reading it out loud in a single breath.

While it is physically possible for the SCP to maneuver on its two back legs, it doesn't appear comfortable and typically walks on all four legs.

Not sure if this is really necessary to mention. I would have also used the terms bipedal and

SCP-000 coat and mane color are highly saturated shades of pink that don't appear to bend and absorb natural light like most objects do, giving SCP-000 a 'cartoonish' 2-D appearance.

This would get more attention and detail. Most notably, I don't know if it's possible to say that it's, well, possible to make something look like that.

On both sides of it's flank appears to be the image of three brightly colored balloons. They appear to be natural to her appearance. SCP-000 claims that the mark is her 'Cutie Mark'.

The appearance of the anomaly tends to be the first thing described, and it's usually in the first paragraph. The main anomalous properties are then explained, after the reader has been informed on what the anomaly looks like.

Upon closer examination it was discovered that it didn't matter what notes SCP did or did not strike, the intended song played out regardless. SCP appears to have no knowledge of how it is able to do this. Further testing will be required.

This sort of stuff would belong in an Addendum, because it documents unknown anomalous properties that you didn't previously mention.

SCP-000 was discovered sleeping under Dr. ███████ desk. It is unknown how she arrived there as there is no caught security footage of her even entering the facility.

SCPs aren't referred to as "he" or "her".

People tend to dislike when anomalous things are conveniently found by the Foundation, since it seems lazy and too coincidental.

Dr. ███████ was interrogated after the discover, however results conclude that he was obvious to the SCP's arrival as well.

oblivious? You might have a bunch of other spelling mistakes, might want to copy and paste your future drafts in Microsoft word, or you could read through the draft itself to find typos.

So yeah, if this were to be an actual article, that's what I would change.

This was great advice, thank you! Although this will be as mentioned, published elsewhere, I'll be making those changes. I'll also be taking all of this into consideration for any upcoming SCP writing. Thank you for taking the time to break it down like you did.

On the other SCP ideas, while the ideas and brainstorming forum is best for those, thought I'd at least give thoughts:

headphones: nope. {common object} that kills you is a trope that got ridden into the ground in the early days of the site.

Magazine: Might could work. It would all hinge on the backstory of why it does that. Bonus points if its not an overbearing parent, straw feminist, or a hyperconservative fundamentalist.

sunglasses: similar to the headphones- thing that does a thing related to what it normally does but way better rarely works well. These days magic items have to make jaded nerds squee, do something completely off the wall or mindbreakingly esoteric, put some massive twist on the formula, or have a masterpiece of a story behind them to stick around.